The MP of Thibaut is missing a MP version of the son named Étienne Henri 'Stephen' II, Count of Blois, of Champagne and of Meaux.
ETIENNE was the father of Stephen of England so presumably there is a MP for him floating around somewhere?
Étienne Henri 'Stephen' II, Count of Blois, of Champagne and of Meaux
The display name is confusing, but is this whom you meant?